Highly recommend staying at Kosin's place! This is a quite place in the middle of big-city bangkok and outer subburb area, and you'll get to know local thai people quite fast. The place is clean, you'll get a balcony to chill outsite and Kosin is doing everything possible to give you a good stay. As he's working in his office closeby there's always someone to help you if you have any problems - or lost your shoes :) .